Once a skill tree has been maxed out, you will then start to gain experience points for a new skill tree.
The 250 new levels allow players to continue to unlock new content after each level up - new unlocks can include new gear, weapons, outfits emblems and even new skills. If you're a Dying Light player that has already completed Dying Light to 100% but you're still looking for a challenge, the 250 legendary levels should grab your interest. The new update adds 250 legendary levels to add more progression to the end-game state of Dying Light. In February Dying Light will receive a new update that is free for all players.